linux - 找不到意外的运算符(Bash 错误)

Question

我创建了一个简单的 Bash 脚本，它应该从输入的目录路径在/usr/local/{etc,lib,include...} 中创建符号链接(symbolic link)

#!/bin/sh

input="$1"
for subdir in "etc include bin lib man share sbin"; do
   dir=$input/$subdir
   if [ -e $dir ] && [ -d $dir ]; then
      for file in $dir/*; do
         ln -s $file /usr/local/$subdir
      done
   fi
done

我得到的错误是:

user@comp:/usr/local# ./update-locallinks /usr/local/test/
[: 6: /usr/local/test/etc: unexpected operator

这就是/usr/local/test/的样子:

user@comp:/usr/local# ls /usr/local/test/
bin
etc
include
lib

Answer 1

总是在测试表达式中用双引号保护你的 bash 变量:

   if [ -e "$dir" ] && [ -d "$dir" ]; then